Flues for exhausting fumes from environments and domestic hoods having such flues

ABSTRACT

The present description relates to a flue ( 1 ) for evacuating fumes from rooms, and relative household hood provided with such evacuation flue, in particular for evacuating cooking fumes, comprising a first stretch ( 2 ) which develops along a vertical direction (A) from an inlet section ( 2   a ); at least one outlet opening ( 4 ) for discharging the fumes along a substantially horizontal direction, the outlet opening ( 4 ) having a height along the vertical direction (A) and a width along a direction orthogonal to the vertical direction (A); a second joining stretch ( 5 ) between the first stretch ( 2 ) and the outlet opening ( 4 ); the height is less than 40 mm, preferably less than 40 mm, preferably less than or equal to 35 mm.

TECHNICAL FIELD

The present description relates to a flue for evacuating fumes from rooms, in particular for evacuating cooking fumes.

Such flue advantageously may be used for extracting cooking fumes from kitchens of any type, for example within the scope of restaurants services, but also in private homes.

More specifically, the flues the object of the present description are used together with the so-called “filtering hoods” which extract cooking fumes and after filtering them, re-emit them into the same indoor room.

BACKGROUND ART

A flue known from the background art comprises a first vertical and rectilinear stretch. Such first stretch has an inlet section which can be connected to any filtering hood on the market.

The first vertical stretch branches off into a pair of second curved stretches which diverge from one another. Each second stretch ends with a respective outlet opening of the fumes.

The fumes are discharged along a horizontal direction.

In other words, the outlet openings lie on respective parallel vertical planes.

The outlet openings are each closed by a respective grid so that it is possible to prevent the introduction of objects from the outside.

In particular, it is to be possible to prevent the introduction of a hand or tool, for safety reasons.

Disadvantageously, following the transit of the cooking fumes, the grid generates turbulence in the fumes themselves. The turbulence is transmitted therefore to the grid which, vibrating against the flue, becomes a significant source of noise.

SUMMARY OF THE DESCRIPTION

In this context, the technical task at the basis of the present description is to propose a flue for evacuating fumes from rooms, in particular for evacuating cooking fumes, which overcomes the above-mentioned drawbacks of the known technique.

In particular, it is the object of the present description to make available a flue for evacuating fumes from rooms, capable of allowing a significant reduction of the acoustic noise generated.

The technical task identified and objects specified are substantially achieved by a flue for evacuating fumes from rooms, in particular for evacuating cooking fumes, comprising the technical features explained in one or more of the appended claims.

One embodiment of the description relates to a flue for evacuating fumes from rooms, in particular for evacuating cooking fumes. Such flue comprises a first stretch that develops along a vertical direction from an inlet section.

The flue has at least one outlet opening for discharging the fumes along a substantially horizontal direction. Such outlet opening has a height along the vertical direction and a width along a direction orthogonal to the vertical direction.

The flue comprises a second joining stretch between the first stretch and the outlet opening.

The height of the opening is less than 40 mm, preferably less than 35 mm.

The flue according to the description resolves the technical problem. Indeed, by reducing the height of the outlet opening and optionally varying the width thereof, it is possible to keep the same aerodynamic performances of the known flue.

However, since the height of the opening was reduced, it is no longer possible to introduce a hand or tool therein.

Thereby, the shape itself of the opening meets the safety requirements without requiring the installation of a grid, which therefore may be omitted. The noise of the flue is therefore significantly reduced.

LIST OF DRAWINGS

Further features and advantages of the present description shall be more apparent from the indicative, and therefore non-limiting, description of a preferred, but not exclusive, embodiment of a flue for evacuating fumes from rooms, in particular for evacuating cooking fumes, as illustrated in the accompanying drawings, in which:

FIG. 1 is a perspective view of a first embodiment of a flue for evacuating fumes from rooms, in particular for evacuating cooking fumes, according to the present description; and

FIG. 2 is a side section view of a second embodiment of a flue for evacuating fumes from rooms, in particular for evacuating cooking fumes, according to the present description.

DETAILED DESCRIPTION

Even when not expressly indicated, the individual characteristics described in reference to the specific embodiments shall be intended as accessories and/or interchangeable with other characteristics described in reference to other embodiments.

Moreover, the numeric values indicated in the present description and in the appended claims are to be intended preceded by the term about and are to be intended with a tolerance range of ±10%.

With reference to the accompanying drawings, 1 indicates a flue for evacuating fumes from rooms, in particular for evacuating cooking fumes, according to the present description.

Flue 1 comprises a first stretch 2 which develops along a vertical direction “A”.

Such stretch is defined at least partly by a substantially cylindrical conduit 3, in which the central axis coincides with the mentioned vertical direction “A”.

An inlet section 2 a of the first stretch 2 is placed at the base of the conduit 3.

The cooking fumes that are evacuated from the flue 1 are sucked by a hood (not illustrated) placed in fluid communication with the conduit 3, even if it is not necessarily connected directly thereto.

The first stretch 2 also has an entrance zone 2 b placed close to the inlet section 2 a. Such entrance zone 2 b has a constant section along the vertical direction “A”.

The flue 1 also has at least one outlet opening 4 for discharging the fumes.

In particular, the fumes are discharged along a substantially horizontal direction.

In other words, the opening 4 is defined on a vertical plane, that is to say parallel to the vertical direction “A”.

Preferably, the flue 1 has a pair of openings 4.

Such openings 4 are symmetrical in shape and arrangement with respect to a centreline plane of the flue 1.

The centreline plane is arranged along said vertical direction “A”.

In other words, the central axis of the conduit 3 lies on the centreline plane.

In greater detail, the outlet openings 4 are rectangular-shaped.

The outlet openings 4 each have a height along the vertical direction “A” and a width along a direction orthogonal to the vertical direction “A”.

According to a preferred embodiment of the description, the height is less than 40 mm, preferably less than or equal to 35 mm.

Preferably, the area of each outlet opening 4, that is to say the product between the height and the width, is comprised between 48 and 56 cm², more preferably equal to 52 cm².

The flue 1 also comprises a second joining stretch 5 between the first stretch 2 and the outlet opening 4.

Preferably, the flue 1 comprises a pair of second stretches 5.

Each second stretch 5 connects the first stretch 2 to a respective opening 4.

In other words, the flue 1 branches off from the first stretch 2 to the second stretches 5.

The second stretches 5 have an upper surface 6. Such upper surface 6 is continuous between the two openings 4.

It is worth noting that the upper surface 6 has a constant development along a horizontal direction parallel to the centreline plane. Contrarily, the upper surface 6 is inclined towards the centreline plane. In greater detail, the upper surface 6 is curved in the direction of the centreline plane.

It is worth noting that a nose 7 of the flue 1 is defined at the junction of the two second stretches 5 from the first stretch 2, that is to say at the centreline plane that defines the plane of symmetry of the flue 1. Such nose 7 in particular is defined by an intersection line between the centreline plane in the upper surface 6.

The upper surface 5 has a first connection 8 at the nose 7.

With reference to FIG. 2, the upper surface 5 also has a pair of second connections 9, each placed between the first connection 7 and the outlet opening 4.

The conduit 3 also has a side surface 10. Such side surface 10 substantially is cylindrical along the entrance zone 2 b of the first stretch 2.

The side surface 10 of each second stretch 5 has a connection portion 10 b with the outlet opening 4. Such connection portion 10 b is opposite to the upper surface 5 and has a third connection 11 at the second connection 9. Such connection portion 10 b has a development which substantially follows the upper surface 5.

The side surface 10 also has a portion 10 c that is transverse to the upper surface 5. Such transverse portion 10 c substantially is arranged vertically.

In the continuation of the present description as well as the appended claims, reference will be made to adimensionalized measurements, in particular length and surface measurements.

Indeed, as is known to the expert in the field of fluid dynamics, the behaviour of a fluid current within a conduit is characterized on the basis of non-dimensional parameters, that is to say compared to a reference parameter of the same type. Within the context of the present description, the linear lengths are adimensionalized with respect to a distance “L1” between the outlet opening 4 and the centreline plane of the flue 1. With regards to the surfaces, they are adimensionalized with respect to the area “S” of the outlet opening 4.

In greater detail, the adimensionalized distance between the inlet section 2 a and the nose 7 is comprised between 0.7 and 0.75.

An adimensionalized radius of the mentioned first connection 8 is comprised between 0.03 and 0.06.

The adimensionalized length of the entrance zone 2 b is less than 0.3.

In greater detail, it is worth noting that the second stretch 5 has a plurality of transverse sections each defined by a respective vertical plane. Each transverse section has an adimensionalized surface calculated as a function of an adimensionalized curvilinear abscissa. Such function is y=−9.391x3+8.2704x2−0.0105x+0.9894.

Clearly, in order to meet contingent and specific needs, those skilled in the art may make several modifications and variants to the configurations described above. Such variants and modifications moreover are all contained within the scope of protection of the description as defined by the following claims. 

1. A household hood of the filtering type comprising a flue for evacuating fumes from rooms, the household hood comprising: a first stretch developing along a vertical direction from an inlet section; at least one outlet opening for discharging said fumes along a substantially horizontal direction, said outlet opening having a height along said vertical direction and a width along a direction orthogonal to said vertical direction; and a second joining stretch between said first stretch and said outlet opening; wherein said height is less than 40 mm, and wherein it comprises a pair of openings that are symmetrical with respect to a centreline plane arranged along said vertical direction, said second stretch having an upper surface, an intersection line between said centreline plane and said upper surface defining a nose of said flue.
 2. The household hood of claim 1, wherein the area of each outlet opening is comprised between 48 and 56 cm².
 3. The household hood of claim 1, wherein the area of each outlet opening is equal to 52 cm².
 4. The household hood of claim 1, wherein an adimensionalized distance between said inlet section and said nose is comprised between 0.7 and 0.75, said adimensionalized distance being calculated with respect to a distance between said outlet opening and a centreline plane of said flue.
 5. The household hood of claim 3, wherein said upper surface has a first connection placed at said nose, an adimensionalized radius of said first connection being comprised between 0.03 and 0.06, said adimensionalized radius being calculated with respect to a distance between said outlet opening and a centreline plane of said flue.
 6. The household hood of claim 4, wherein said upper surface has a first connection placed at said nose, an adimensionalized radius of said first connection being comprised between 0.03 and 0.06, said adimensionalized radius being calculated with respect to a distance between said outlet opening and a centreline plane of said flue.
 7. The household hood of claim 1, wherein said first stretch comprises an entrance zone close to said inlet section, said entrance zone having constant section along said vertical direction, said entrance zone having an adimensionalized length less than 0.3, said adimensionalized length of said entrance zone being calculated with respect to a distance between said outlet opening and a centreline plane of said flue. 